Safety attachment for hoisting machinery.



Patented Ian. 9, I900.

T. H. OXNAM. I SAFETY ATTACHMENT FOR HOISTING MACHINERY.

(Application filed Sept 26, 1899.)

m: Noam: PETERS co.v PNOTILLIYNQ, WASLIINGTCIM n. c.

I l with raw ric THOMAS HENRY OXNAM, OF LOS ANGELES, CALIFORNIA.

SPECIFICATION forming part of Letters Patent No. 6%1,145, dated January9, 1900. Applicati n l d September 26, 1899. serial No. 731:748. (lilomodel.)

To all whom, it may concern:

Be it known that I, THOMAS HENRY OXNAM, a citizen of the United States,residing at Los Angeles, county of Los Angeles, State of California,have invented an Improvement in Safety Attachments for HoistingMachinery; and I hereby declare the following to be a full, clear, andexact description of the same.

My invention relates to a device for preventing accidents to hoistingmachinery by reason of the cage being carried up into the sheaves of thegallows-frame by accident or carelessness.

It consist of a device actuated bythe cage when the latter is carriedupward beyond its proper point and connections between said devicewhereby the actuating mechanism is thrown out of gear or prevented fromoperating.

It also comprises details of construction, which Will be more fullyexplained by reference to the accompanying drawings, in which the figureis a general view of my improvement.

The object of my invention is to prevent dangerous and fatal accidentswhich occur in operating all hoisting machinery by reason of the cagebeing carried up beyond its proper stopping place and into contact withthe sheaves or other part, whereby breakages are caused. This device maybe applied to any form of hoisting machinery, whether actuated by steam,electricity, air,water, or other power, and it will be manifest that bysuitable mechanical arrangement it may be applied to any such apparatus.

In the present case I have illustrated my invention as applied to ahoist which is actuated by a steam-engine.

A represents the cage, guided and movable between the guide-posts B, andO is a hoisting-cable passing over the sheaves D at the top of thegallows-frame, so called, and thence passing to the winding-drum E, uponwhich it is coiled to raise the cage and from which it is uncoiled tolower it.

F is a wheel having a portion cut out, as shown at f. The periphery ofthe wheel projects into the line of travel of the cage, and the wheel issuitably journaled at some point upon the gallows-frame intermediatebetween the sheaves and the point where the cage should stop, so that ifthe cage passes above this point it will contact with the wheel andcause it to turn.

H is a rod or equivalent connection between the wheel and the lever I,by which the throttle-valve of the engine or other equivalentcontrolling mechanism is actuated, and when the wheel is turned itoperates through this rod to either shut off steam, air, or water or cutoff the electrical circuit, so that the hoisting-power will beautomatically thrown out of action. In this manner the cage will bestopped without the attention of the engineer or operator and will beprevented from passing the point of safety.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination with a cage and the hoisting mechanism therefor, of awheel jour naled in the shaft at right angles to the path of movement ofthe cage and having a pcripheral stop disposed in the path of the cage,a motor having a valve controlling the hoisting mechanism, and a rod orconnection having one portion attached to the valve and another portioneccentrically and directly connected with the wheel whereby the axialmovement of the latter imparts an endwise pushing movement to the rod orconnection and actuates the valve.

2. The combination with a cage and the hoisting mechanism therefor, of awheel journaled transversely in the shaft and having a portion of itsperiphery cut away and lying in the path of movement of the cage, a0011- trolling mechanism having a valve controlling the power to thehoisting mechanism, a lever on the valve, and a rod connected directlywith said lever and directly and eccentrically connected with the wheelwhereby an axial movement of the latter moves the rod in the directionof its length and actuates the valve.

In witness whereof I have hereunto set my hand.

THOMAS HENRY OXNAM. Witnesses:

ALPHONSO 0. DAY, JOHN WILLIAMS.

